1) Will we be still able to see emails in OutLook Express, Email Servers?2) If we select multiple contacts in CRM, it shows its sending as TO: instead of BCC:3) Will each of the contacts see each other?

This integration will actually work as Bitrix24 & your email server connector, meaning:

1) Will we be still able to see emails in OutLook Express, Email Servers? - yes (both webmail or CRM integration)2) If we sel ect multiple contacts in CRM, it shows its sending as TO: instead of BCC: - CRM email integration is separate from mail connector (web mail under My workspace)3) Will each of the contacts see each other? - if you send fr om Bitrix24 CRM the recepients won'r see each other